Learner failing to finish book bothered facilitator (7)
I believe the answer is:
enabler
'facilitator' is the definition.
(I've seen this before)
'learner failing to finish book bothered' is the wordplay.
'failing to finish' means to remove the last letter.
'book' becomes 'b' (abbreviation for book).
'bothered' indicates an anagram.
'learner' with its final letter removed is 'learne'.
'learne'+'b'='learneb'
'learneb' with letters rearranged gives 'ENABLER'.
(Other definitions for enabler that I've seen before include "Something that makes (action) possible" , "One who makes possible" , "Someone who makes something possible for another" , "It makes (thing) possible" , "One giving authority" .)